Features FOR THREAD REPAIR: This tap insert kit is ideal for repairing peeling or damaged female threads and maintaining threads from galling. DRILL AND TAP: These drills and taps are made of high speed steel, with high strength and wear resistance for quick and easy thread repair. THREAD INSERTS: Spiral wire inserts are heat treated high carbon steel construction for wear and corrosion resistance and long service life. 45 STEEL PART: Heat treated 45 steel part fits into enlarged holes for tightening, allowing you to hold bolts, screws or spark plugs in place. MULTIPLE SIZES: Including 5 common sizes, which can be used to repair M5 M6 M8 M10 M12 female thread holes to meet the different repair needs. Feature: 1. FOR THREAD REPAIR: This tap insert kit is ideal for repairing peeling or damaged female threads and maintaining threads from galling. 2. DRILL AND TAP: These drills and taps are made of high speed steel, with high strength and wear resistance for quick and easy thread repair. 3. THREAD INSERTS: Spiral wire inserts are heat treated high carbon steel construction for wear and corrosion resistance and long service life. 4. 45 STEEL PART: Heat treated 45 steel part fits into enlarged holes for tightening, allowing you to hold bolts, screws or spark plugs in place. 5. MULTIPLE SIZES: Including 5 common sizes, which can be used to repair M5 M6 M8 M10 M12 female thread holes to meet the different repair needs. How to Use: A HSS tap per size, a HSS drill per size, 2 insert tools per size, threaded inserts per size, all in a convenient storage case. Specification: Item Type: Thread Repair Set 5 Common Sizes: M5x0.8x6.7mm, M6x1x8mm, M8x1.25x10.8mm, M10x1.5x13.5mm and M12x1.75x16.3mm Outer Box Size: Approx. 375 x 175 x 30mm / 14.8 x 6.9 x 1.2in Spiral Insert Material: High Carbon Steel Drill And Tap Material: High Speed Steel Package List: 1 x Thread Repair Kit (131Pcs Tools)1 x English User Manual 1 x Storage Box Package List 1 x Thread Repair Kit (131Pcs Tools) 1 x English User Manual 1 x Storage Box